A tunnel in the romanian town of Berzasca
Reference

Safe passage through the Danube Gorge in Romania

In the Romanian town of Berzasca, a key infrastructure project to improve road safety was realized with the construction of a rockfall gallery on national road DN 57. MC-Bauchemie supported it with proven product systems – from concrete admixtures and injection products to concrete cosmetics and surface protection for the tunnel interior.

Rockfall gallery protects national road DN 57 in Romania

Romania

In the Romanian town of Berzasca, a central infrastructure project to improve road safety was implemented with the construction of a rockfall gallery on national road DN 57. MC-Bauchemie supported the project by providing proven product systems – from concrete admixtures and injection products to concrete cosmetics and surface protection for the tunnel interior.

The national road DN 57 runs through the spectacular Clisura Dunării region in southwestern Romania. This scenic but geologically challenging route is an important link for passenger and freight traffic as well as tourism.

 

Due to the rocky terrain, rockfalls repeatedly led to road closures and safety risks. The authorities therefore initiated the construction of a 110-meter-long rockfall gallery – a tunnel-like protective structure that permanently secures the road. In addition, a more than 200-meter-long retaining wall was built to stabilize the slope. Work began in February 2023 and was completed in spring 2025. The main contractor MARISTAR consciously chose MC-Bauchemie due to positive past experience and the high quality of the products. The execution was carried out by the company EdilKam & Art.

Major challenges: narrow space, steep slope, time pressure

The key technical challenge was the combination of a narrow construction site, a steep slope, and the requirement to build a durable, load-bearing structure – largely without closing DN 57. This placed high demands on concrete technology: the material not only had to meet the highest structural standards but also be easy to work with and develop strength quickly. A specially tailored concrete mix was therefore used, produced at the Liati Turnu Severin plant, incorporating two MC concrete admixtures: Muraplast FK 19 and MC-PowerFlow 5395.

110 m of protection: the new rockfall gallery along DN 57 near Berzasca sustainably improves safety in the Danube gorge.

110 m of protection: the new rockfall gallery along DN 57 near Berzasca sustainably improves safety in the Danube gorge.
© MC-Bauchemie

The tunnel coating MC-Color T 21 is applied using an airless spray process.

The tunnel coating MC-Color T 21 is applied using an airless spray process.
© MC-Bauchemie

Tailor-made concrete with MC admixtures

Muraplast FK 19 is a high-performance plasticizer that reduces internal friction in the concrete mix, thereby improving workability – especially for densely reinforced elements like the gallery beams. It also ensures consistency and homogeneity, making it easier to place and compact the concrete. MC-PowerFlow 5395 is a high-performance superplasticizer based on the latest MC polymer technology and additionally promotes accelerated strength development. This combination was instrumental in shortening formwork times and completing the construction within the planned schedule.

Comprehensive protection with MC products

For local leakages, MC-Injekt 1264 compact and MC-Injekt 2700 L were used – two injection resins that reliably seal cracks and leaks to ensure the long-term watertightness of the structure. In addition, cosmetic concrete repair products from MC provided a uniform appearance.

 

To protect the inner shells and portals of the tunnel from wear and tear, the client opted for MC-Color T 21, an innovative one-component tunnel coating from MC that is easy-to-apply and provides a matt shiny, colour-stable surface with high light reflectance (LRV ≥ 70). This improves visibility inside the tunnel and enhances energy efficiency. Thanks to its high resistance to UV radiation, weathering, frost, and de-icing salts as well as its excellent cleanability, MC-Color T 21 also provides long-term protection and reduces maintenance costs.

 

Thus, MC products contribute to the safety and stability of the infrastructure in the Clisura Dunării region, ensuring year-round accessibility for local freight traffic and tourism.

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